222 CRINOIDS. 



Calceocrinus ventricosus (Hall). 



Cheirocrinus ventricosus Hall, 1860: 13th Reg. Rep. New York State Cab. 



Nat. Hist., p. 123. 

 Cheirocrinus daetylus Hall, 1860: 13th Reg. Rep. New York State Cab. 



Nat. Hist., p. 123. 

 Cheirocrinus nodosus Hall, 1860 : 13th Reg. Rep. New York State Cab. Nat. 



Hist., p. 123. 

 Calceocrinus daetylus Shumard, 1866: Trans. St. Louis Acad. Sci., vol. II, 



p. 358. 

 Calceocrinus ventricosus Shumard, 1866: Trans. St. Louis Acad. Sci., vol. 



II, p. 359. 

 Cheirocrinus wachsmuthi Meek «fe Worthen, 1869: Proc. Acad. Nat. Sci., 



Phila., p.74. 



Calyx small, compressed, slightly longer than wide, a little 

 concave in the middle of the dorsal side. Base somewhat 

 trigonal, twice as wide as high. Eadials four in number, very 

 irregular, the two longer ones occupying about three-fourths 

 of the anterior side of the calyx and supporting two small 

 brachials ; the two smaller radials are also quite irregular. 

 Arms composed of simple joints. 



Horizon and localities. — Lower Carboniferous, Lower Bur- 

 lington limestone : Louisiana. 



Calceocrinus tunicatUs (Hall). 

 Plate XXX, [fig'. 4. 



Cheirocrinus tunicatus Hall, 1860: 13th Reg. Rep. New York State Cab. 



Nat. Hist., p. 124. 

 Calceocrinus tunicatus Shumard, 1866: Trans. St. Louis Acad. Sci., vol. 



II, p. 359. 

 Calceocrinus robustus Worthen, 1891: Geol. Sur. Illinois, vol. VIII, p. 92, 



pi. xii, fig. 7. 

 Calceocrinus tunicatus Worthen, 1891: Geol. Sur. Illinois, vol. VIII, p. 93, 



pi. xii, fig. 6. 



Closely related to G. ventricosus^ but much larger and 

 heavier. 



Horizon and localities.— hoy^er Carboniferous, Keokuk 

 limestone: Keokuk ( Iowa). 



